Form for casting plastic material



July 6 1926;

F. Hsu-langsam Foam Fon CASTING PLASTIC MATERIAL Filed March 28, 1925A 3 Smets-Sheet "1 uga@ ATTORNEYS.

F. H. SHERRERD FORI! FOR CASTING PLASTIC IIATERIAL .I uly 6 1926.

Filed March 28, -1925 s sheets-sha' E/ QA TToRNEYs.

- July 6 1926.

1,591,060 F. H. SHERRERD FORM FORy CASTING PLASTIC MATERIAL Filed March 28; 1925 5 SheetslSheat 3 Patented Jeiy 6, 192s.

FRANCIS E; sianRRnitn-on EAsr .ti-RANGE, NEW @insieme-sistencia 'ro NEwAItIrc/:GN-

:Y CRETE Prienl oo., von itnwenisirnw' JERSEY-, A CoRro- RA'rroNor NEW JnnsiiY.

f 'gronivt Fon Gelernte PLASTIC:y iyrArEn1AL. f

- lamination sied Maren 28,1925. semaine." issie.

.invention has reference to an proved construction of torni or .meldder casting @concrete 'pipe andthe-like, and the invention relates;.more particularly, to a' novel construction and combination of inner land outer forms madeofseparable sections,

the inner being provided. with ano'vel'mea'ns vkfor v`,cont racting-V i the saine "prepara-tory to withdrawing lthe same "t'roni' the finished casting. t f i i The inventionv has 4for its principalobject to vprovide a novelconstruction or' form., or mold comprising a hollow cylindrical outery form mounted on 1a suitable. base,^anda contractilole4 inner rform consisting of a plu rality of radially movable sections Vhaving means whereby the sameiinay be withdrawn fromA a inished casting," and Ywhereby the initiation of the' withdrawing movement will vsuccessively vcontract diametrically opposed sections toremove the Asaine from.. engagement with the yinternal surfacesof the lin*- rished casting. l y 'A Ai Other objects of this invention, not at this time more jparticularlyenumerated, will lbe clearly understood from the y following detailed description of the same.

l "l The invention is clearly illust ated the .accompanying drawings, in which:--v Y Figure l is a side elevation oimy im proved form or mold; i-gureQ isa part .side elevation with theouter -tormin'sec' tion; Figure 3 isa top end view, showing Ythe inner form expanded to. operative Vrelavtion Vto theouter form, said view being drawnvon an enlarged Scale; Figure 4 is a view'siinilar to Figure 3 but vshoiving the Vinner torni Contracted preparatory `to withdrawal-o .the same from the finished casting; Figure. 5 is a vertical longitudinal section taken on line 5-5 in'V Figure'; Fig

ure 6 is a vertical longitudinal section taken Von line 6;.-6 in .Figure 3 Figure Tisa rfrag- Vvmentary'vertical longitudinal section taken onjline 7-1-7 in Figure ta'and Figur-e 8 is a; Vfragmentary Yvertical longitudinal vsection taken on line 8.-,8 injFigure 4.

Figure 9 is a fragmentary part ration vand part longitudinal section, showing a modilied arrangement and construction oft means tor contractingthe inner form; Figure 10 yis .al part sectional' View.

Ataken on line lO-l() in Figure V9, and lFigurelll is a. view similar to that shown `in Figure 105v buti'llustratingthe pa'frtialjop-v Similar vcharacters ci. Ap loy'edV in fall of the hereinabove ydescribed v.

side eleving and' withdrawing `the'inii'er form.-

Figure 191s a fragmentary part s1de;ele-.

vation andpart longitudinal section,fsho w ing ,another modified arrangement and 'conf' struction of means'orcontracting the inner form; and' Figure 13' is va part sectional view i views, toindicate(corresponding partsfl l reference. lare' ei'n- Y drawings, I have ,illustratedtherein oneembodiment .ot myfn'ovel construction Yot -oi'm` or moldgtor casting" concrete pipeandjtlie like. In said' drawings, the VVreference char-1 outer .torm comprises two orrmore sections which, when assembled together, provide a cylindrical outeroasing or forml waljl. Said `sections 3" are preferablyV made of sheet ni-etah'and the respective sections 3' thereofV l '80 are provided,l adjacent to Vvadjoining edges,

with` headedV studs 4, adapted to.' receive Vfound Yconvenient ordesirable,v may beV` sub- ,stituted l toi-[said4 studst and ,linksY `V5.

It desiiedthe'baseil may be provided l with a suitably .shaped center lt'iossorv core 6, if it is desi-red to produce a 'bell-mouthed end in connection with the pipe casting; but

if ,simplev straight pipe sectionsfare desired to be produced, said center boss' or Vcore 6 may be omitted from the base'` 1.

The yJnpper surface or' said base l isprovided with a lcountersunll sea-t 7 ,correspondy.ing in diametery to vthevoirtsid'e diameter of the vinn-er form, and thusV provi-ding an an- ,nularshould-er 8 against which said inner form; whenjexpanded, is engaged,v and'by which the sameis concentrically spaced in proper relation to thefoutery form..

Said inner ormcomprises a series ot in-V Vacterl l indicates a. hajsefnieniberlliaving av Araisedlooss 2 providing'a shoulder for seating the lower lend or' the outer' form. Said teritting sections, preferably arranged in pairs,y thef members of which 'are in diametrically-opposed. relation, which, for Vconvenience `of dentificatioml shall denoniinate,V

by` reference v'to their. relative movements when contracting the forni lpreparatoryYto withdrawing the same from a .lnished'cast- .retracted positions fshowiifinfligures 4,' u7

and 8whe`reby the same arewitlidrawn or separated from engagement: withV the internal surfaces'of the castingVV 22; The inner form being-,thus contracted' the same may be readilyhoisted and withdrawn endywise fromV the interior of said Vcasting 22.

Y. i io assembled forrfepe'atedfuse. f i Referring, nowtdF-igures ,o The outer foriii.'c`omprisedof the sections ymay new bel u'n'coupled"v and" taken apart, thus entirely freeing 'the casting '22" for re1- inoval'; after Ywhich theiforms' may A r'ee 9, i; and ii, i have sliown'tl'ierein a modified form 'of' coirnections between the members `,or sectionsw 9 andlOof the inner forni andthe central pull rod 12, which are adapted, howevenfto effect theAk initialAv or hfirstjmoveinent 'of the members or sections 9', andV the delayed move#v ment ofthe members or sections 10 in the same timed relation as already above dey-,f scribed. Said modificationscomprise onevor Y more groups of'connections to actuate the first moving members or v(sections 9, each groupfconsisting of asleeve 23, which is ixedon said pullro'd12. Said sleeve 23 is is provided with oppositelyprojecting fulcrum lugs 24 with whichk are respectively *,:pifvoted normallyfhorizontal links Vor tog-` gles 25, the outer yends of the 4latter being' respectivelypivotally engaged Yby the cross# pins 18 with Vthe lugs loof the respectiveA first moving` members or sections 9. One or l more groups ofconnections aire provided to actuate the last moving members or sections 10, eachgroup consistin'gof a sleeve 26 longitudinally .slidable on said pull-rod 12. Said sleeve 26lis provided with oppositely projecting fulcrum lugs 27 with which are respectively pivoted normally horizontal links or toggles l28, the outer ends of Vwhich are -respectively pivotally engaged by the,

y cross-pins 21 with thelugs 19 of the respective last -moving members or sections 10. Fixed on said `pull rod 12, suitably spaced below said sleeve 26is a' lift collar 2,9.

In operating saidmodified groups of con- I' nections to retract therniembers or sections 9 and 10 to thereby contract the inner form for removal .from the interior'of a completed casting22,an upward pull is exert# ed on the pull `ro'd 12 which moves upwardly therewith the sleeve 23 fixed thereon. The upward movement of the sleeve'23 by pulling upwardly lthe inner ends of the links or toggles 25exert's a laterally and inwardly drawing leffect upon the first moving vmembers or sections 9, to thus retract the same from circumferentially alined relation to the members ori sections. INhi'le the' first moving members or sections 9 are thus beingV actuated, the lastmoving members' orsec# tions 10 remain stationary, by reason of the fact that the pull rod- 12 isfree tovslide up,-v ,wardly through the sleeve 26 until the lift collar ,29-l isfbrought into engagementV with the lower end of'said sleeve 26. Byy the time thev advancemovement of the'V members or sections 9 i'sfco'mplete'd; vthe lift'.collaif29,

abu'ts the lowerendfo'f the sleeve26, lso that 'f7 on {continiiedY upward;movement y'of theV pullf#v rod 12 said sleeve 26 is in-t'uinliftedv to pull f 'upward the inner ends ofthe li-nlsor toggles thereby exerting a 'laterally' and4 inwardlyd-rawing effect upon? the last iiiovin-g mein- Referring'now :tof Figuresf'12fai1di'13i I v have sli-own a 'further modification; ofthe. means for contracting the inner form. This modification comprises a combination ofthel linkV or toggle arrangement foractuatingthe irstmoving members or sections `9,'as

above describedand as indicated by correi sponding yreference characters vapplied to cam means for actuating the "last moving, members or sections 10, asalso abovedevsaid Figures 12 and4 13,. with 'the delayed v e scribed and as indicated by corresponding y' reference characters applied to said Figures 12 and .13.' Theoperation ofthisarrangef ment will be understood from the above dey scription withoutnecessity for repetition.'`

y From the foregoing description, it willbe Y apparent, that-my invention provides a very simple and easily manipulated' setlof forms for casting pipe from plastic materials.

ico.

I am aware-that somefcha'ng'esmay be made in the` general arrangements and combinations of the various devices and parts, aswell as in the details of the constituctionj vi051 Y ofthe same, without departing from't'he i' scope of my present inventionfas described y in the foregoing specification, `and as defined in the appended claims. Hence, I do Ynot iio limitV -my invention to the exact arrange-j ments and combinations of the 'devices and parts as set forth in the foregoing specification, nor do I confine myself to the exact l details ofthe construction ofrsaid vparts as Iv claim 'z-- 1. A form vfor casting :illustrated in theV accompanying drawings. 5"" i pipe from plastic i material, comprising albase, an'outerv cylin-V drical form consisting ofV separable circumferentially alined sections, meansl on said Vbase for positioning said outerform `sections, an inner cylindrical form, means on i said base for positioningsaid'inner form in vco-iicentrically spaced relationto said outer y form, said inner form comprising a plural# ity of circ-umferentiallyv alined, sections ar`` Y yranged in independently movable pairs, a

longitudinal central pull rod within said inner form, upper and lower knuckle vblocks iXedly secured to said pull rod, toggle links connected between vsaid knuckle .blocks and one pair of said inner form sections, addif .tionalupper and lower knuckle blocks slidably related to said pull rodstogglelinks lconnected between said latter knuckle blocks andthe remaining pair of inner form secf tions, andr collars .iXe'dnon said pull rod in normal spaced relationto andV beneatligsai'd slidableknuckle blocks, allwhereby longitudinal movement of said' pull rod will retract the firstanentioned pair of inner Vform sections in advance ofv said .remaining pairv thereof. f a

i 2Q .In a formfor casting hollow structures frromi plastic material, an innerl form com'- .prising a plurality of circumferentially alined sections arranged in independently'- movable pairs, a longitudinal central pull rod within said inner form, upper and lower knuckle blocks 'iiXedly secured to said pull rod, toggle Vlinks connectedfbetween said Y knuckle blocks 'and' one pair of said inner form sections;v additional upper and lower Vpull rod in-normal'space'd relation to and beneathV said slidable knuckle blocks, all

whereby longitudinal movement of said pull rod will retract,V the first mentioned pair of Vinner form sections' inv advance of said re-y Vnnalning pair thereof.A

In testimony thatl claim the vinvention Y set forth above I have hereunto set my hand this 26th day of March 1925.

FRANCIS H. SHERRERD. 

